| Difficult Run to Bonhill | 3,420.34 mi (5,504.51 km) |
| Difficult Run to Bonnyrigg | 3,477.26 mi (5,596.10 km) |
| Difficult Run to Bootle | 3,523.22 mi (5,670.07 km) |
| Difficult Run to Borehamwood | 3,668.32 mi (5,903.59 km) |
| Difficult Run to Boscombe | 3,624.09 mi (5,832.41 km) |
| Difficult Run to Boston | 3,650.20 mi (5,874.44 km) |
| Difficult Run to Bottesford | 3,612.71 mi (5,814.10 km) |
| Difficult Run to Bourne | 3,640.35 mi (5,858.58 km) |
| Difficult Run to Bournemouth | 3,622.54 mi (5,829.91 km) |
| Difficult Run to Bournville | 3,584.81 mi (5,769.19 km) |
| Difficult Run to Bovingdon | 3,656.15 mi (5,884.01 km) |
| Difficult Run to Bowdon | 3,549.23 mi (5,711.93 km) |
| Difficult Run to Boxley | 3,709.45 mi (5,969.78 km) |
| Difficult Run to Brackley | 3,624.81 mi (5,833.58 km) |
| Difficult Run to Bracknell | 3,654.15 mi (5,880.78 km) |
